纤维桩桩道预备时机对根尖微渗漏影响的体外对比研究

目的：对比纤维桩桩道不同预备时机对根尖微渗漏的影响。方法收集30颗离体下颌单根管前磨牙，采用ProTaper冠向下法预备根管，热牙胶垂直加压充填技术充填根管后，将样本随机平分成3组， A组为即刻桩道预备组，B组为2d后桩道预备组，C组为7d后桩道预备组。染料渗入法及透明牙技术处理后，在显微镜下记录各组根尖微渗漏长度，并进行t检验统计学分析。结果 A组根尖微渗漏长度为（0.96±0.15）mm ，B组根尖微渗漏长度为（0.97±0.11）mm ，C组根尖微渗漏长度为（1.01±0.12）mm ，3组样本根尖微渗漏值均较小，且3组结果之间差异均无统计学意义（P＞0.05）。结论纤维桩桩道预备时机对根尖微渗漏无明显影响。

An in vitro comparative study on the effect of different timing of post space preparation on apical microleak-age of fiber posts

Objective To compare the effect of different timing of post space preparation on apical microleakage of fiber posts. Methods A sample of 30 human mandibular first premolars with single root canal was collected. They were prepared with Protaper system by the crown?down technique and obturated with gutta?percha+AH?plus by warm vertical condensation technique. The teeth were randomly assigned to three groups (n=10/group). Group A, immediate post space preparation. Group B, delayed post space preparation after two days. Group C, delayed post space prepara?tion after seven days. All the specimens were dyed with India ink and transparented, and then the apical permeated lengths were measured under microscope. And t test statistical analysis were conducted. Results The mean apical permeated lengths of the three groups were all slight, and were (0.96 ± 0.15) mm in group A, (0.97 ± 0.11) mm in group B, (1.01 ± 0.12) mm in group C, respectively. There was no significant difference between the two groups (P>0.05). Conclusion Different timing of post space preparation caused no significant differences on apical microleakage of fiber posts.